diff --git a/sonde-api-to-iot-core/lambda_function.py b/sonde-api-to-iot-core/lambda_function.py
index ab68970..829efcd 100644
--- a/sonde-api-to-iot-core/lambda_function.py
+++ b/sonde-api-to-iot-core/lambda_function.py
@@ -101,6 +101,12 @@ async def upload(event, context):
             event["time_server"] = datetime.datetime.now().isoformat()
             payload["user-agent"] = event["headers"]["user-agent"]
         payload["position"] = f'{payload["lat"]},{payload["lon"]}'
+        current_year = datetime.datetime.now().year
+        if payload["datetime"].split("-")[0] not in [str(current_year), str(current_year-1), str(current_year+1)]:
+            # skip any telm that's not last year, this year or next year
+            print(payload)
+            print("Not within time range - not suitable to add to queues")
+            continue
         if time_delta:
             payload["upload_time_delta"] = time_delta
         if "uploader_position" in payload:
diff --git a/sqs_to_s3.tf b/sqs_to_s3.tf
index 33f44aa..31616fb 100644
--- a/sqs_to_s3.tf
+++ b/sqs_to_s3.tf
@@ -91,7 +91,7 @@ resource "aws_lambda_function" "sqs_to_s3" {
 resource "aws_lambda_event_source_mapping" "sqs_to_s3" {
   event_source_arn                   = aws_sqs_queue.sqs_to_s3.arn
   function_name                      = aws_lambda_function.sqs_to_s3.arn
-  batch_size                         = 5
+  batch_size                         = 3
   maximum_batching_window_in_seconds = 15
 }